ICD-10 Code D42.1 – Neoplasm of uncertain behavior of spinal meninges (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D42.1 – Neoplasm of uncertain behavior of spinal meninges
What it is
This code identifies a spinal meningeal tumor whose behavior is uncertain, meaning the pathology cannot clearly classify it as benign or malignant. Use it when the lesion arises from the meninges surrounding the spinal cord.
Clinical signs
Clinical features vary; refer to documentation. Patients may present with spinal pain, neurologic deficits, or symptoms from cord or nerve root compression, but the diagnosis depends on imaging and pathology findings.
When to use this code
Use D42.1 when the provider documents a neoplasm of uncertain behavior involving the spinal meninges, including a confirmed pathologic or radiologic diagnosis. It is appropriate for lesions described as uncertain, borderline, or of unclear malignant potential. Check documentation if the site is spinal rather than cranial.
Do not use for
Do not use this code for benign or malignant spinal meningeal tumors when the behavior is clearly stated. Also avoid it if the documentation identifies a different spinal structure or if the site is not specified.
Coding tip
Verify both the anatomic site and the tumor behavior in the provider record before assigning D42.1.